Question

The length of the mercury thread is found to be 4cm and 24cm at ice point and steam point respectively on an ungraduated thermometer.What is the temperature corresponding to a length of 8cm?​

Answer 1

The difference between ice and steam in Celsius (Centigrade) is 100 deg.

So the difference between and 4 cm and 24 cm of the thread corresponds to 100 deg C.

So 8 cm is 4 cm greater than the ice point

4 cm / 20 cm = 1/5 since the steam point and the ice point are 20 cm apart

Then 1/5 * 100 deg C = 20 deg C the requested temperature